Finding the Fourth Proportional to 72.61, 108.82 and 40.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72.61 : 108.82 = 40.12 : x
2. Step 2: Convert to fraction form
   72.61/108.82 = 40.12/x
3. Step 3: Cross multiply
   72.61x = 108.82 × 40.12
4. Step 4: Simplify right side
   72.61x = 4,365.86
5. Step 5: Solve for x
   x = 4,365.86/72.61
6. Step 6: Final answer
   x = 60.13